00554naa#a2200181#i#450# EN\\bibl\112752 20260118143440.7 2311-1402 20170925b2017####ek#y0engy0150####ca RUS RU REVISITED THE EVOLUTIONARY AND PERSPECTIVE DEVELOPMENT OF EXTREME SPORTS IN THE TYUMEN REGION Journal article Nizhnevartovsk Nizhnevartovsk State University 2017 5 с. Journal article local . 796(571.12) RUS Ivanov V A vestnik.nvsu.ru